Ultrasonic backscatter imaging by shear-wave-induced echo phase encoding of target locations.
Ultrasonic backscatter imaging by shear-wave-induced echo phase encoding of target locations.
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通过目标位置的剪切波引起的回波相位编码进行超声反向散射成像。
DOI：
10.1109/tuffc.2011.1777
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发表时间：
2011-01
期刊：
影响因子：
--
通讯作者：
McAleavey S
中科院分区：
文献类型：
--
作者：
McAleavey S
我们提出了一种新的方法，用于超声背向散射成像，其中通过使用行波剪切波编码的目标在接收到的回波的相位的横向位置获得的目标的横向分辨率。我们表明，作为剪切波数的函数的相位调制可以表示在目标回声的横向分量的傅立叶变换。通过在剪切波空间频率范围内测量相位调制获得的逆变换产生横向散射体分布。范围数据恢复的飞行时间，在传统的超声，产生一个B模式的图像。与传统的超声成像，其中使用机械或电子聚焦和横向分辨率是由孔径大小和波长，我们证明，横向分辨率使用所提出的方法是独立的属性的孔径。横向分辨率的目标是实现使用一个固定的，未聚焦的，单元件换能器。我们提出了模拟图像的目标的均匀和非均匀的剪切模量。复合斑点减少证明。最后，我们演示了在均匀剪切模量的明胶体模中使用未聚焦传感器的图像形成。
We present a novel method for ultrasound backscatter image formation wherein lateral resolution of the target is obtained by using traveling shear waves to encode the lateral position of targets in the phase of the received echo. We demonstrate that the phase modulation as a function of shear wavenumber can be expressed in terms of a Fourier transform of the lateral component of the target echogenicity. The inverse transform, obtained by measurements of the phase modulation over a range of shear wave spatial frequencies, yields the lateral scatterer distribution. Range data are recovered from time of flight as in conventional ultrasound, yielding a B-mode-like image. In contrast to conventional ultrasound imaging, where mechanical or electronic focusing is used and lateral resolution is determined by aperture size and wavelength, we demonstrate that lateral resolution using the proposed method is independent of the properties of the aperture. Lateral resolution of the target is achieved using a stationary, unfocused, single-element transducer. We present simulated images of targets of uniform and non-uniform shear modulus. Compounding for speckle reduction is demonstrated. Finally, we demonstrate image formation with an unfocused transducer in gelatin phantoms of uniform shear modulus.